How do I burn large files across multi-CDs ?

I use an iBook G4 & worry a lot about backing it up.
All that music, bank statements & lord knows what lost in an instant if something goes wrong.
So I invested in Intego Personal Backup which is great for backing up to an external drive.
But what it wont do is back up a .dmg file to CDs. It gets half way through & blobs out everytime.
Can anyone recommend something to burn my .dmg file to CDs ? It is 3.5GB.

Also you can download a free backup program to backup to multiple DVDs / CDs called Backup. It is part of the .Mac subscription. You can backup smaller files to your Internet storage and your big backups to DVD / CDs.

Toast 7 is the way to go...splits large files and folders automatically across as many discs as you need... each disc has a small 1 MB software tool that can then rejoin the files... prompts you to insert discs. Can take these discs over to any Mac... don't need to have Toast on it to join the files back together.

.Mac is the wrong way to go IMO... you need to maintain your .Mac account in order to restore... fine if you want to pay Apple $100 per year to rent your files.

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